Issued Patents All Time
Showing 26–49 of 49 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6366379 | REMOTE CONTROL DEVICE OF ACOUSTO-OPTIC TUNABLE FILTER AND OPTICAL TRANSMISSION SYSTEM CONTAINING EQUALIZER USING ACOUSTO-OPTIC TUNABLE FILTER AND OPTICAL TRANSMISSION SYSTEM CONTAINING OPTICAL ADD/DROP MULTIPLEXER USING ACOUSTO-OPTIC TUNABLE FILTER | Takafumi Terahara | 2002-04-02 |
| 6366376 | Optical transmitting device using wavelength division multiplexing to transmit signal lights having frequencies arranged to eliminate effects of four-wave mixing (FWM) | Hideyuki Miyata, Hiroshi Onaka | 2002-04-02 |
| 6351323 | Optical transmission apparatus, optical transmission system, and optical terminal station | Hiroshi Onaka, Hideyuki Miyata, Kazue Otsuka, Yutaka Kai, Tadao Nakazawa | 2002-02-26 |
| 6344914 | Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier | Naomasa Shimojoh, Takafumi Terahara | 2002-02-05 |
| 6335823 | Optical amplifier for use in optical communications equipment | Chihiro Ohshima, Susumu Kinoshita | 2002-01-01 |
| 6292289 | Method, device, and system for transmitting a supervisory optical signal | Yasushi Sugaya | 2001-09-18 |
| 6285479 | Optical cross connect unit, optical add-drop multiplexer, light source unit, and adding unit | Kazue Okazaki, Hiroshi Onaka, Hideyuki Miyata, Yutaka Kai | 2001-09-04 |
| 6278536 | Optical transmission device for bi-directional optical communication | Yutaka Kai | 2001-08-21 |
| 6178037 | Optical amplifying apparatus | Yasushi Sugaya, Susumu Kinoshita, Hiroshi Onaka | 2001-01-23 |
| 6055092 | Multi-wavelength light amplifier | Yasushi Sugaya, Miki Takeda, Susumu Kinoshita | 2000-04-25 |
| 5903385 | Remotely pumping type multi-wavelength light transmission system | Yasushi Sugaya | 1999-05-11 |
| 5875054 | Bidirectional optical amplifier circuit | Yoshihito Onoda | 1999-02-23 |
| 5737118 | Optical amplifying apparatus | Yasushi Sugaya, Susumu Kinoshita, Hiroshi Onaka | 1998-04-07 |
| 5729372 | Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system | Takafumi Terahara, Masuo Suyama, Takao Naito | 1998-03-17 |
| 5701195 | Light signal reception apparatus having an improved light surge eliminating function | — | 1997-12-23 |
| 5568305 | Heterodyne receiver provided with a frequency discriminator for coherent lightwave communications | Takao Naito, Hiroshi Onaka | 1996-10-22 |
| 5539566 | Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system | Takafumi Terahara, Masuo Suyama, Takao Naito | 1996-07-23 |
| 5253097 | Demodulator and a polarization diversity receiver for coherent optical communication provided with the demodulator | Takao Naito, Shigeki Watanabe, Tetsuya Kiyonaga, Hiroshi Nakamoto, George Ishikawa | 1993-10-12 |
| 5228043 | Direct modulation phase shift keying (DM-PSK) transmission system | Takao Naito, Shigeki Watanabe, Hideo Kuwahara | 1993-07-13 |
| 5115332 | Receiver for coherent optical communication | Takao Naito, Shigeki Watanabe, Tetsuya Kiyonaga, Yoshihito Onoda, Hideo Kuwahara | 1992-05-19 |
| 5052051 | Heterodyne receiver for coherent optical communication | Takao Naito, Shigeki Watanabe, Tetsuya Kiyonaga, Yoshihito Onoda | 1991-09-24 |
| 5050176 | Direct modulation phase-shift-keying system and method | Takao Naito, Shigeki Watanabe, Tetsuya Kiyonaga, Hiroshi Onaka, Yoshihito Onoda | 1991-09-17 |
| 5003626 | Dual balanced optical signal receiver | Hideo Kuwahara, Tetsuya Kiyonaga, Chiaki Ohsawa | 1991-03-26 |
| 4965858 | Polarization diversity optical receiver for coherent optical communication | Takao Naito, Shigeki Watanabe, Tetsuya Kiyonaga, Yoshihito Onoda, Hideo Kuwahara +2 more | 1990-10-23 |